\\[-1.8ex] Soil Heterogeneity & $-$2.994$^{***}$ & $-$3.050$^{***}$ & $-$2.809$^{***}$ & $-$2.927$^{***}$ \\ 
  & (0.800) & (0.787) & (0.775) & (0.769) \\ 
\\[-1.8ex]
Dependent Variable Mean & 67.82 & 67.36 & 67.74 & 67.24 \\ 
Dependent Variable SD & 6.30 & 6.09 & 5.98 & 5.79 \\ 
Observations & 23,437 & 23,437 & 23,437 & 23,437 \\ 
R$^{2}$ & 0.548 & 0.543 & 0.542 & 0.536 \\ 
